Sorry, don't know the first thing about rigging.

And just to clarify, the "overlapping" geometry issue is not in the my morphing and magnet efforts (the "after" of the "before" and "after" renders).    I'm referring to the "composite" figure depicted in the third image, the refinery assault.  Because Scott_A "cut" the body part groups very differently between his GFW figure and his Delgadosaurus, there's just no way one can align every edge polygon through positioning and scaling alone.  Think of it this way, the upper nech group of the GDW is basically "tucked" into the neck region of the "D-saurus" like a pant leg into a boot.

No, to make a proper, seamless, combined figure, enough polygons would need to be deleted in the neck regions of both figures to actually leave a gap between the two, and then new polygons created to bridge that gap.  Afterwards, there's all the steps to correct the grouping, assign UVs, correct joint parameters and fall-off zones, etc.  Of course, you know all that stuff as you are a content creator/vendor.

That stuff is FAR beyond my meager skills.  I'm doing good just getting the figures to stand aligned with the floor, not floating inches above it.  ;-)

Sincerely,

Bill

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Tempt the Hand of Fate and it'll give you the "finger"!